Jump-spark plug for explosion-engines.



W. W.KING. JUMP SPARK PLUG PoE EXPLOSION ENGINES.

APPLICATION FILED NOV. 2,1906.

Improvements in Jump- Spark Plu s for -UNITED sini-jus PATENT oirnrca.

l Specification o! Letters Patent. I Patented June 1, 1909. Application led November 2, 1906. Serial No. 341,698.V

To all whom it may concern: the central opening in the block. This Be it known that l, WILLIAM W. KING, a citizen of the United States, and resident of Huntsburg, county of Geauga, State of Ohio, Ihave invented certain new and useful fi m of incrusted matter would have to form between the metal base and the iirin pin, and also creates an inner surface whic be readily cleaned and kept free from ncrustation or water, and is also protected by the long exterior surface. The air s ace 7 Explosion-Engines, of which l here y declare the following to be a full, clear, and exact Ldescription, su'ch as will enable others skilled in the art to which it appertains to make and use the same.

Th'e objects of the invention are to increase the efliciency, durability and reliability of the jump spark firing plug for gasolene or gas engines which are exposed to the weather, and especially for use with engines exposed to sea water, where the saline deposit will gradually coat the exterior surface of the insulation of the plug and form a conducting iilrn, which will be suilicient for the current to travel over from the frame to the central'liring pin without jumping the firing gap in the interior of the engine cylinder.

The short circuiting of the current causes the spark to misre Iand the gas in the engine will not explode, and when the gas fails to explode duringtwo or three turns l of the engine shaft the engine comes to a dead stop. l remedy this defect by means of the forms of constructionand combination and arrangement of parts as hereinafter described, shown in the accompanying drawings and specifically pointed out in the forms one terminal of the electric current. claims. The pin 1 has upon its extremity a rotating ln the accompanying drawings, Figure 1 wheel with inclined vanes 14, which forms is a vertical longitudinal section of the dethe other terminal, with the spark gap 12 arvice g and Fig. 2 is a horizontal transverse ranged between the projecting end of the section thereof. Fig. 3 is a bottom view plug and the vanes. As they rotate in the and Fig. 4 is a detail of spark wheel. cavity in thel plug, the spark constantly ln these figures, 1 is the central firing pin, f changes its position, and lhence the liability having one end of the circuit wire 2 secured of choking the spark by carbon deposit is rebetween the ,nuts 3 and 4. j duced to the minimum, and the danger .of

5 is the insulating block formed of mica, bridging the spark gap is avoided. mica paper, porcelain or other insulating The vanes 14 are caused to rotate rapidly material that will not corrode or deteriorate after each explosion of gas, and hence the the larger portion ofthe pin 1.

8 is a cap which is attached to the upper end of the firing pin, an'd held in place by nut 4, and it is provided with a downwardly of the insulating block 5 and is made enough larger in diameter than the block to leave an air space 10 between itself and the block. This air space should not be less in width than the width of the spark gap so that the current cannot pass to the cap from any film of water or from any incrustation upon the outer surface of the block 5. This cap is preferably formed of some` effective insuj lation that is tough and will stand the weather, and will not be easily broken. It can if necessary, be made of metal.

The object of the cap is to protect the upper part of the outside surface of insulating block 5, but especially the inner surface thereof from s ray and dirt, and therefore to keep the insi e surface clean, and dry,and preserve its insulating qualities.

The plug 6 screws into the cylinder and s ace increases the distance over which the canenvelops the upper portion and pre erably turned flange 9 which incloses the upper end under the influence of weather or heat when 1 spark gap will be kept open until a com lete subjected to outside exposure. This block circular bridge is formed in the inside o the insulates the firing pin 1 from the metallic i plug, equal in width to the width of the gap.

part 6 of the firing plug. j 15 is an annular nut that holds the insulat- To prevent a ilrn from forming, which will 'j ing block 5 in a recess in the plug and bears connect the frame or metallic parts of the 1 on the shoulder 16.

plug with the firing pin, an annular air space 17 is a nut which clamps the lower end of 7 is formed about the firing pin between the the pin 1 in the block 5.

pin and the insulating block 5 by enlarging i Patent is which prevents the gas or fumes from -theenl 'ne from entering the cavity of the insulat- 1n block. .y

am aware that a closed cavity has been employed in an insulating block to form a I? vortex of air and gas to expel carbon deposits, but I believe myself to be the first to II employ an open but protected air space for the purpose described. A

Having described the invention what I claim as new and desire to secure by Letters 1. In a sparking device, the combination with ametal plu'g, of an insulating block sei cured therein and rojecting therefrom,.and i having an enlarged central opening extending inward from the outer end, a firing )in longitudinally passing through said insu ati ing block and central opening therein, the said opening forming an air space about the body of said pin, a cap secured to the outer f extremity of said tiring pin and spaced from jthe adjacent end of the insulator and having an annular liange depending therefrom of larger diameter than said insulating block, and terminating short of the plug whereby an annularl air space is formed above and encircling a portion of said block, substantially as described.

2. A sparking device coml rising a metal plug forming one terminal o anelectric circuit, a firing pin forming the other terminal, an insulating block in said plug pro'ecting therefrom, through which block sai tiring pin projects, means for securing said insulating lock in said plug, and means for securin said firing pin in said insulating block,A said block having an enlarged opening therein, extendingV inward from the outer end about the body of said pin, and a cap secured to the upper end of said pin, and extending vertically downwardly about the exterior of the upper portion of said insulating block and spaced therefrom and of the plug, substantially as described.

In testimony whereof I hereunto set my hand this 31st day of October 1906.

WILLIAM W. KIN G.

Witnesses:

WM. M. MoNioE, Gao. COLE.

terminating short 

